Question

I need help with number 6 someone please work it out need to show work

Answer 1

If I read this diagram correctly then

DE 9x - 31 y implies that the slope y / x = 9/31 = .29

and arctan .29 = 16 deg

and line CD 7x - 2y implies that slope y / x = 7/2 = 3.5

and arctan 3.5 = 74 deg

So in that interpretation the difference is 58 deg

But, I'm not certain of the terminology being used.